(a) The county annually shall impose a separate ad valorem tax in an amount not to exceed the limit approved by the voters under Subchapter B.
(b) The taxes may be used to pay:
(1) the bonds issued by:
(A) the county under Subchapter F; or
(B) any other governmental entity for property transferred by that entity under Section 327.158; or
(2) maintenance or other expenses of the zoo board.